Objective: Share and critique peer solution strategies for take from with result unknown and take apart with addend unknown word problems from the teens.
Grade 1 Mathematics Module 2, Topic B, Lesson 21
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Common Core Learning Standards
|1.OA.1||Use addition and subtraction within 20 to solve word problems involving situations of adding to,...|
|1.OA.4||Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the...|
|1.OA.6||Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use...|